辽河油田不同类型油藏产量递减规律研究

THE PRODUCTION DECLINE LAW RESEARCH ON DIFFERENT TYPES OF RESERVOIRS IN LIAO HE OILFIELD

辽河油田油藏类型复杂多样,通常在不分类型的情况下,采用常规模型对全区产量进行预测,其准确性较差。在常规递减率预测模型(Arps、Weibull、HCZ等模型)递减特征分析的基础上,对一种预测油气田产量的通用模型进行了重点研究,该模型可用以描述开发全过程的产量变化规律和递减率变化规律。结合辽河油田实际生产数据,通过研究不同类型油藏(中高渗砂岩、热采稠油、低渗透和特殊岩性)产量的递减规律,确定了四种类型油藏的模型参数,进行了产量递减率预测与验证,准确性很高。进而确定了各类油藏不同开采阶段的合理递减指标,对辽河油区的产量预测具有很好的实用价值。

The reservoir type is complicated in liaohe oilfield,and its accuracy is poor to forecast the regional production using the conventional models without classification. On the basis of analysising the production declining characteristics using the conventional prediction models( the Arps,Weibull,HCZ models,and so on),we do research on a general model of predicting oil and gas production,and the model can be used to describe the rules of the development changing and decline rate changing in the whole process. In combination with the practical production datas of Liaohe oilfield,doing research on production declining rules of different types of reservoirs( Middle and high permeability sandstone,thermal recovery of heavy oil,low permeability,and special lithology),we determine the model parameters of the four types of reservoirs,and finish the production decline rate prediction and verification. So it is sure that the accuracy is high. Then we determine the reasonable decreasing indexes of different mining stages of the four kinds of reservoirs,and it has good practical value for production prediction in Liaohe oilfield.